1 files changed, 1 insertions, 0 deletions
diff --git a/c/win.h b/c/win.h
index a77362f..93b1416 100644
--- a/c/win.h
+++ b/c/win.h
@@ -2,6 +2,7 @@
 #define WIN_H
 
 #include <optional>
+#include <string_view>
 #include <windows.h>
 
 /* Run given procedure at creation of next window. */